Did the United States test an anti-satellite weapon when it shot down an out-of-control spy satellite earlier this month? Or was it a precautionary measure to protect people on the ground who might have been hit with a fuel tank filled with a poisonous gas?

What if North Korea and Iran become nuclear states? If the United States must live with a nuclear Iran and North Korea, what policies should it adopt? Furthermore, could the U.S. change its foreign policy to reduce the risk of nuclear proliferation to even more countries?